public class Example8_4 {
    public static void main(String[] args) {
        double sum=0,item=0;
        boolean computable=true;
        for(String s:args) {
            try{
                item=Double.parseDouble(s);
                sum=sum+item;
            }
            catch (NumberFormatException e) {
                System.out.println("您输入了非数字字符:"+e);
                computable=false;
            }
        }
        if (computable)
            System.out.println("sum="+sum);
    }
}
